How common is relapse of infective endocarditis (IE)?

Updated: Jan 03, 2019
  • Author: John L Brusch, MD, FACP; Chief Editor: Michael Stuart Bronze, MD  more...
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Answer

Relapse of IE usually occurs within 2 months of finishing clinically effective therapy. Infection with S aureus, enterococci, and gram-negative organisms (especially P aeruginosa) is associated with a high rate of relapse. Enterococcal infection of the mitral valve has the greatest potential for relapse.

Recurrent IE occurs most often in individuals who abuse IV drugs. Valvular infections in these patients recur at a rate of 40%. Those with pretreatment symptoms of IE of more than 3 months’ duration are at greater risk for relapse. Other significant risk factors for recurrence include a previous episode of IE, the presence of a prosthetic valve, and congenital heart disease.

In general, infected vascular catheters should be removed and should not be replaced over a guidewire. Surgically implanted devices, such as Broviac or Hickman catheters, do not necessarily need to be removed unless evidence of IE, a tunnel infection, or suppurative thrombophlebitis is present or if the infecting organism is a Corynebacterium species, a Pseudomonas species, a fungus, S aureus, or a Mycobacterium species. If bacteremia persists longer than a few days, the catheter must be removed. [105, 106]


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